//
// --------------------------------------------------------------------------
//  Gurux Ltd
// 
//
//
// Filename:        $HeadURL$
//
// Version:         $Revision$,
//                  $Date$
//                  $Author$
//
// Copyright (c) Gurux Ltd
//
//---------------------------------------------------------------------------
//
//  DESCRIPTION
//
// This file is a part of Gurux Device Framework.
//
// Gurux Device Framework is Open Source software; you can redistribute it
// and/or modify it under the terms of the GNU General Public License 
// as published by the Free Software Foundation; version 2 of the License.
// Gurux Device Framework is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of 
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
// See the GNU General Public License for more details.
//
// More information of Gurux products: https://www.gurux.org
//
// This code is licensed under the GNU General Public License v2. 
// Full text may be retrieved at http://www.gnu.org/licenses/gpl-2.0.txt
//---------------------------------------------------------------------------

package gurux.dlms.objects;

import java.util.ArrayList;
import java.util.List;
import java.util.Map.Entry;

import javax.xml.stream.XMLStreamException;

import gurux.dlms.GXByteBuffer;
import gurux.dlms.GXDLMSClient;
import gurux.dlms.GXDLMSSettings;
import gurux.dlms.GXSimpleEntry;
import gurux.dlms.ValueEventArgs;
import gurux.dlms.enums.DataType;
import gurux.dlms.enums.ErrorCode;
import gurux.dlms.enums.ObjectType;
import gurux.dlms.internal.GXCommon;

/**
 * Online help: <br>
 * https://www.gurux.fi/Gurux.DLMS.Objects.GXDLMSSapAssignment
 */
public class GXDLMSSapAssignment extends GXDLMSObject implements IGXDLMSBase {
	private List<Entry<Integer, String>> sapAssignmentList;

	/**
	 * Constructor.
	 */
	public GXDLMSSapAssignment() {
		super(ObjectType.SAP_ASSIGNMENT, "0.0.41.0.0.255", 0);
		sapAssignmentList = new ArrayList<Entry<Integer, String>>();
	}

	/**
	 * Constructor.
	 * 
	 * @param ln Logical Name of the object.
	 */
	public GXDLMSSapAssignment(final String ln) {
		super(ObjectType.SAP_ASSIGNMENT, ln, 0);
		sapAssignmentList = new ArrayList<Entry<Integer, String>>();
	}

	/**
	 * Constructor.
	 * 
	 * @param ln Logical Name of the object.
	 * @param sn Short Name of the object.
	 */
	public GXDLMSSapAssignment(final String ln, final int sn) {
		super(ObjectType.SAP_ASSIGNMENT, ln, sn);
		sapAssignmentList = new ArrayList<Entry<Integer, String>>();
	}

	public final List<Entry<Integer, String>> getSapAssignmentList() {
		return sapAssignmentList;
	}

	public final void setSapAssignmentList(final List<Entry<Integer, String>> value) {
		sapAssignmentList = value;
	}

	@Override
	public final Object[] getValues() {
		return new Object[] { getLogicalName(), getSapAssignmentList() };
	}

	/*
	 * Returns collection of attributes to read. If attribute is static and already
	 * read or device is returned HW error it is not returned.
	 */
	@Override
	public final int[] getAttributeIndexToRead(final boolean all) {
		java.util.ArrayList<Integer> attributes = new java.util.ArrayList<Integer>();
		// LN is static and read only once.
		if (all || getLogicalName() == null || getLogicalName().compareTo("") == 0) {
			attributes.add(1);
		}
		// SapAssignmentList
		if (all || !isRead(2)) {
			attributes.add(2);
		}
		return GXDLMSObjectHelpers.toIntArray(attributes);
	}

	/*
	 * Returns amount of attributes.
	 */
	@Override
	public final int getAttributeCount() {
		return 2;
	}

	/*
	 * Returns amount of methods.
	 */
	@Override
	public final int getMethodCount() {
		return 1;
	}

	@Override
	public byte[] invoke(final GXDLMSSettings settings, final ValueEventArgs e) {
		if (e.getIndex() == 1) {
			List<?> tmp = (List<?>) e.getParameters();
			int id = ((Number) tmp.get(0)).intValue();
			String str;
			if (tmp.get(1) instanceof byte[]) {
				str = new String((byte[]) tmp.get(1));
			} else {
				str = tmp.get(1).toString();
			}
			if (id == 0) {
				for (Entry<Integer, String> it : sapAssignmentList) {
					if (it.getValue().compareTo(str) == 0) {
						sapAssignmentList.remove(it);
						break;
					}
				}
			} else {
				sapAssignmentList.add(new GXSimpleEntry<Integer, String>(id, str));
			}
		} else {
			e.setError(ErrorCode.READ_WRITE_DENIED);
		}
		return null;
	}

	@Override
	public final DataType getDataType(final int index) {
		if (index == 1) {
			return DataType.OCTET_STRING;
		}
		if (index == 2) {
			return DataType.ARRAY;
		}
		throw new IllegalArgumentException("getDataType failed. Invalid attribute index.");
	}

	/*
	 * Returns value of given attribute.
	 */
	@Override
	public final Object getValue(final GXDLMSSettings settings, final ValueEventArgs e) {
		if (e.getIndex() == 1) {
			return GXCommon.logicalNameToBytes(getLogicalName());
		}
		if (e.getIndex() == 2) {
			int cnt = 0;
			if (sapAssignmentList != null) {
				cnt = sapAssignmentList.size();
			}
			GXByteBuffer data = new GXByteBuffer();
			data.setUInt8(DataType.ARRAY.getValue());
			// Add count
			GXCommon.setObjectCount(cnt, data);
			if (cnt != 0) {
				for (Entry<Integer, String> it : sapAssignmentList) {
					data.setUInt8(DataType.STRUCTURE.getValue());
					data.setUInt8(2); // Count
					GXCommon.setData(settings, data, DataType.UINT16, it.getKey());
					GXCommon.setData(settings, data, DataType.OCTET_STRING, GXCommon.getBytes(it.getValue()));
				}
			}
			return data.array();
		}
		e.setError(ErrorCode.READ_WRITE_DENIED);
		return null;
	}

	/*
	 * Set value of given attribute.
	 */
	@Override
	public final void setValue(final GXDLMSSettings settings, final ValueEventArgs e) {
		if (e.getIndex() == 1) {
			setLogicalName(GXCommon.toLogicalName(e.getValue()));
		} else if (e.getIndex() == 2) {
			sapAssignmentList.clear();
			if (e.getValue() != null) {
				boolean useUtc;
				if (e.getSettings() != null) {
					useUtc = e.getSettings().getUseUtc2NormalTime();
				} else {
					useUtc = false;
				}
				for (Object item : (List<?>) e.getValue()) {
					String str;
					Object tmp = ((List<?>) item).get(1);
					if (tmp instanceof byte[]) {
						str = GXDLMSClient.changeType((byte[]) tmp, DataType.STRING, useUtc).toString();
					} else {
						str = tmp.toString();
					}
					sapAssignmentList.add(
							new GXSimpleEntry<Integer, String>(((Number) ((List<?>) item).get(0)).intValue(), str));
				}
			}
		} else {
			e.setError(ErrorCode.READ_WRITE_DENIED);
		}
	}

	@Override
	public final void load(final GXXmlReader reader) throws XMLStreamException {
		sapAssignmentList.clear();
		if (reader.isStartElement("SapAssignmentList", true)) {
			while (reader.isStartElement("Item", true)) {
				int sap = reader.readElementContentAsInt("SAP");
				String ldn = reader.readElementContentAsString("LDN");
				sapAssignmentList.add(new GXSimpleEntry<Integer, String>(sap, ldn));
			}
			reader.readEndElement("SapAssignmentList");
		}
	}

	@Override
	public final void save(final GXXmlWriter writer) throws XMLStreamException {
		if (sapAssignmentList != null) {
			writer.writeStartElement("SapAssignmentList");
			for (Entry<Integer, String> it : sapAssignmentList) {
				writer.writeStartElement("Item");
				writer.writeElementString("SAP", it.getKey());
				writer.writeElementString("LDN", it.getValue());
				writer.writeEndElement();
			}
			writer.writeEndElement();
		}

	}

	@Override
	public final void postLoad(final GXXmlReader reader) {
	}

	@Override
	public String[] getNames() {
		return new String[] { "Logical Name", "Sap Assignment List" };
	}

	@Override
	public String[] getMethodNames() {
		return new String[] { "Connect logical device" };
	}
}